package com.leo.contentcenter.configuration;

import com.alibaba.cloud.nacos.NacosDiscoveryProperties;
import com.alibaba.cloud.nacos.ribbon.NacosServer;
import com.alibaba.nacos.api.exception.NacosException;
import com.alibaba.nacos.api.naming.NamingService;
import com.alibaba.nacos.api.naming.pojo.Instance;
import com.netflix.client.config.IClientConfig;
import com.netflix.loadbalancer.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;

/**
 * @author leo
 */

@Slf4j
public class NacosWeightedRule extends AbstractLoadBalancerRule {

    @Autowired
    private NacosDiscoveryProperties nacosDiscoveryProperties;

    @Override
    public void initWithNiwsConfig(IClientConfig iClientConfig) {
        //读取配置文件，并初始化NacosWeightedRule
    }

    @Override
    public Server choose(Object o) {
        try {
            //Ribbon的入口
            BaseLoadBalancer loadBalancer = (BaseLoadBalancer) this.getLoadBalancer();
//        log.info("lb = {}", loadBalancer);

            //想要请求的微服务的名称
            String name = loadBalancer.getName();

            //实现负载均衡算法 实现NacosClient的算法，需要注入NacosDiscoveryProperties

            //拿到服务发现的相关API
            NamingService namingService = nacosDiscoveryProperties.namingServiceInstance();

            //nacos client 自动通过基于权重的负载均衡算法，给我选择一个实例。
            Instance instance = namingService.selectOneHealthyInstance(name);

            log.info("选择的实例是：port = {}, instance = {}", instance.getPort(), instance);

            return new NacosServer(instance);
        } catch (NacosException e) {
            return null;
        }
    }
}
